Tacking-machine



(No Model.)

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Patented Oct. 18

WITNEEE E5 UNITED STATES PATENT (Erica MATTHIAS BROOK, OF BOSTON, ASSIGNOR 'lO GEORGE W. COPELAND, OF

MALDEN, MASSACHUSETTS.

TACKlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 248,398, dated October 18, 1881.

Application filed July 5, 1881. (No model.)

To allv whom it may concern: Be it known that I, MATTHIAS BROOK, of

Boston, in-the county of Suffolk, in the Comdescription, reference being bad to the accompanying drawings, forming a part of this specification, in explaining its nature, in which Figure 1 is a view, part in vertical section and part in elevation, of a portion of my tacking-machine. Fig. 2 is a view in vertical crosssection. These views (Figs. 1 and 2) represent the shape of the throat and driver and their relation to the i'eedway hereinafter more fully described. Fig.3 is a section representing the old construction of throat. Fig. 4 is a perspective of the throat-block. Fig. 5 is a vertical central section of the throat, with the tack-strip resting on the ledges c and the tack in position to be driven. Fig. 6 represents the old form of throat and the relation of the tack and tack-strip thereto. Fig. 7 represents, in plan and section, a piece of thetackcarrying strip after the tacks have been driven through the same, illustrating the operation thereon of the old mechanism which removes or punches a portion of the strip with every tack driven. Fig.8 represents, in plan and section, a tack-strip from which the tacks htwe been removed or driven by the mechanism herein described. Fig. 9 is a horizontal section on the line to w of Fig. 1. Fig. 10 is a vertical section on the line y y of Fig. 1.

This invention is an improvement upon that described in Letters Patent No. 197,608, dated November 27, 1877, and No. 234,854, datedNovember 30, 1880; and it consists in a modification in the construction and shape of the throat or driveway and driver of themachine, by which the tack is pushed or driven from the tack-strip without punching or severing a portion of the under or thicker portion of the tack-holding strip, thereby avoiding the liability of the clogging of the throat which exists to a certain extent in the two inventions above referred to.

The invention also relates to a modification in construction of the feed-pawl, whereby the tack is fed uniformly in a line parallel with the axes of the throat or driveway, because the pawl is adapted to come in contact with the shank of the tack near its head, and also the point, thereby preventing it from being tilted while it is being fed and when moved by the stop-pawl or abutment.

To accomplish the first-named object of my invention I make the throat cot the machine, at the point where the feedway b enters it, or, to be more precise, that portion of the throat immediately below the ledge c which supports the tack-carrying strip, suflicientl y large to prevent that portion of the throat or feedway acting, in connection with the driver, as a punch. In the invention described this portion of the throat of the machine is barely large enough to provide for the reciprocation of the driver therein and no more. Consequently the edge of the throat acts as a die in connection with the punch, and the result is that a portion of the paper-supporting strip about the head of the tack was punched out with the tack. This very often occasions annoyance, as the paper wedges between the surface of the throat and the driver and clogs the machine, whereas by making the throat larger at this point it ceases to actas a die in connection with the driver.

It will be obvious from the description that the edge a of the feedway about the throat supports the tack-carrying strip in such a manner that the lower or thicker portion of the carrying-strip yields downwardly upon the contact of the driver with the head of the tack, allowing the tack to be pushed through it without removing a portion, and, if not, if a small piece of the paper should he accidentally removed, it could not act to clog the throat, as the space between the vertical surface of the throat and the surface of the driver is suffio ciently wide to prevent anysuch wedgin g action as occurs when the lit is a nice one from taking place.

The end of the driverdshould not be larger than the head of a tack, and preferably should be a little smaller, and in no event should it be so large as to make what is termed a nice fit with the throat.

Another advantage arising from the con slruction described is thatit is not as essential 10o to locate the tacks in their supporting-strip that they shall always hear a given position in relation to each other and each edge of the strip, for if one should happen to be out of line the throat is so large that the edge of the head would not thereby be caused to project upon the ledge supporting the carrying-strip, whereas with the old construction it is necessary to center the tack very accurately in the throat, and if the tack should happen to be out of line and its head project upon the stripsupporting ledge it would very likely result in the clogging of the throat.

The throat preferablyis reduced in diameter gradually below the enlarged portion,in order that the tack may be properly supported while being driven.

The form of the throat which I prefer to use has the bevel eabout the upperedge, and is gradually tapered or reduced in diameter from the bottom of the beveled portion downward, as represented in the drawings.

The feed-pawl f and the abutment g are operated in the manner described in the firstLetters Patent referred to; but thepawl,instead of being provided with one arm or finger for closing behind the shank of the tack, is pro vided with two arms or fingers, and the abutment'is arranged to operate between them. These two fingers or arms h are arranged so that the upper one bears or shuts behind the shank of the tack near the head, and the lower one behind the shank at or near the point, and consequently as they move thetack forward against the inclined surface of the abutment the tack is not moved from a line substantially parallel with the throat. In case, however, one finger or arm only is used,thereisaliabilityofthrowing the tack out of this vertical position, particularly in moving it by the abutment, as the abutment is pressed back during the forward movement of the tack-strip by the contact of the shank of the tack therewith.

I prefer to make the throat in a block, m, of

. hardened steel, and I represent the general shape of this block, the throat being formed in one end thereof, with the exception of one side, which communicates with the feed-way. The block is planed across its end to form the recess m, in which the lower finger or arm 0f 50 the feed-pawl enters in feeding. It also has the projection on upon one side, and the two pins m which enter corresponding holes in the frame of the machine, whereby the block is held securely in position between the two side plates, m m.

The use of this invention has been stated in connection with the'description.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United S,tates- 1. In a machine for driving tacks from a tack-supporting strip, the arrangement and combination of the strip-supporting ledge or bed adjacent to the throat, the inverted-bellshaped or enlarged throat described, and the driveway and driving mechanism, whereby the tack is driven from a strip as specified, and the clogging of the machine is prevented.

2. In atacking-machine,the removable block m, containing the upper portion of the throat of the machine, substantially as described.

3. The feeding-pawl f, having two arms or projections, h, all substantially as described.

4. The combination, in a tacking-machine, of the two reciprocating tack-feeding projections or armsf, and the abutment g, arranged to project into the feedway between said feeding projections or arms, all adapted to operate substantially as described.

5. In a machine for driving tacks from a tack-supporting strip, the combination of the tack-feedingmechanism with the drivingmechanism specified, the same consisting of the driver and an inverted-bell-shaped or enlarged throat, as described, surrounded by a stripsupporting ledge or bed, all substantially as set forth.

MATTIIIAS BROOK.

Witnesses:

F. F. RAYMOND, 2d, W. C. Foes. 

